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Why does unitarity imply a branch cut in the $S$-matrix after $s > 4m^2$ where $s$ is the Mandlestam variable and $m$ is the mass of...
Asked on 10/28/2021
1 answerThis is more of a conceptual question. Normally a conservation law will look something like $$frac{partial j}{partial t}+frac{partial F}{partial x}=0tag{1}$$ where $x$ is typically a real-valued coordinate, or...
Asked on 10/28/2021
1 answerThe following problem is taken from Exercise 1.7 in David Morin's "Special Relativity: For the Enthusiastic Beginner":A train and a tunnel both have proper length L. The train moves toward...
Asked on 10/28/2021
2 answerI'm doing a project where I want to calculate the moment of inertia for some objects. I've broken the objects down into simple objects like cubes, spheres, cylinders, etc --...
Asked on 10/06/2021
2 answerWikipedia states thata clock that is moving relative to [observer] will be measured to tick slower than a clock that is at rest in their frame of...
Asked on 10/06/2021 by elendir
2 answerConsider a 2d scalar field theory with quartic interaction$$S[phi]=int d^2x left((nablaphi)^2+m^2(phi^2+gphi^4)right)$$I want to compute the partition function$$ Z[m,g]=intmathcal{D}phi,e^{-S[phi]}$$say as a function of $m,g$....
Asked on 10/06/2021
1 answerWhen a thick plate of glass is hit (strong enough) by an object (say a shoe, by which I don't like to encourage vandalism, but I think that's happened when...
Asked on 10/05/2021
1 answerI have been very interested in this question since reading Electricity Misconceptions by K-6 There are two perspectives I have come across for how energy flows in a...
Asked on 10/05/2021
3 answerThe question is extention of thought experiment proposed by Einstein of light pulses in a train cart called Einstein's train. Assume that light pulses are emitted from...
Asked on 10/05/2021
2 answerIt is well-known, that in $phi^4$ theory in 3d there is interaction fixed point: $$S_{Lambda} = int d^dx left[frac{1}{2}(partial_i phi)^2 + frac{1}{2} mu_0^2 phi^2 + Lambda^{d-4} tilde{g}_0...
Asked on 10/05/2021
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